say it: SAHND-hahym
sondheim is a noun meaning "United States composer of musicals (born in 1930)". It carries one recorded sense.
United States composer of musicals (born in 1930)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for sondheim come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.